Prior to space, huge efforts were made by manufactures to offer reliable wrist tool-watches for pilots.
If Longines is the most obvious of all, there are some others, Gallet is one of them
They produced in the early 40s this waterproof chronograph called "Flying Officer" for WWII US and British pilots
This one has many details to offer along with many innovations at the time
certainly one of my sexiest chronograph !
HAGWE
Best,
Laurent